Eaton 945U-E Installation Manual

Instruction Leaflet IL032045EN

Effective Febuary 2016 Version 2.0

945U-E wireless Ethernet modem
installation guide

Installation steps

This guide provides installation drawings and instructions
appropriate for most applications. For more information, refer to
the user manual.

1. Connect the GND terminal on the back of the 945U-E to
earth/ground.

2. Install the antenna.

3. Connect the 945U-E to a DC power supply and power on.

NOTE

This equipment is suitable for use
in ClassI Division 2 groups A, B,
C and D hazardous locations, or
nonhazardous locations only.

4. Connect the
configure the
configuration details.

Antenna installation

When selecting an antenna, consider radio proximity. For short
distance paths, check the receive signal level. If it exceeds
–40dBm, a 20 dBm you must fit an attenuator in-line with the
coaxial cable. Do not use demonstration antennas for the final
installation.

Use Figure 1 as a guide for installing an antenna and attaching it
to the 945U-E.

Figure 1. Antenna Installation

945U-E

to your computer via Ethernet and

945U-E

. Refer to the user manual for

WARNING

EXPLOSION HAZARD

Do not disconnect equipment while
the circuit is live or unless the area
is known to be free of ignitable
concentrations. Substitution of any
component may impair suitability for
Class I Division 2.

Statutory requirements

FCC: Unlicensed operation limits
the radio power. High gain aerials
may only be used to compensate
for cable losses. .

945U-E

M4 x 5 mm

Module

Connection

Wavelength: 13" (33 cm)

Surge Arrestor
(recommended)

at least 11 AWG (4 mm

Provide good ground
connection to mast,
module, and surge
arrestor.

If ground conditions
are poor, use more
than one stake.

Coaxial Cable

GND

GND

Antenna* 1 Wavelength

Stress
Relief
Loop

2

)

Earth Stake

(minimum)

Weatherproof
Connections
(recommended:

™

3M

23 self-

bonding tape)

Mast

Earth Conductor
at least 5 AWG

2

(16 mm

)

*

For maximum
range, install
above local
obstructions.

Instruction Leaflet IL032045EN

RS-485

SUPPLY

ETHERNET

(HUB)

100M

LINK

B A

-

B A

SUPPLY

+

-

DIO

COM

B A

B A

B A

+

DIO

COM

B A

RS-485

SUPPLY

B A

+

-

DIO

COM

B A

B A

RS-485

SUPPLY

B A

+

-

DIO

COM

B A

Effective Febuary 2016

Version 2.0

945U-E wireless Ethernet modem installation guide

EATON_945U-E Install Guide

NOTE

All connections must be SELV <50 Vac and <120 Vdc.

If the wireless Ethernet modem is installed as Category 3
equipment, it must be installed in an enclosure that maintains
an ingress protection rating of IP54 and meets the enclosure
requirements of EN50014 or EN60079-0.

If the wireless Ethernet modem is installed in a hazardous
environment, coaxial cable must be installed in a metallic conduit,
per NEC requirements.

Digital Output will activate for approximately 5 seconds during the
device power up sequence.

 WARNING

The wireless Ethernet modem enclosure contains aluminum and is
considered to constitute a potential risk of ignition by impact or friction.
This must be taken into account during installation.
The non-metallic cover of the wireless Ethernet modem constitutes an
electrostatic discharge hazard. Clean only with a damp cloth.

The following illustration shows the ports and switches on the
945U-E. The Ethernet port is wired for a hub or switch.

Factory
Default
Switch

100M LINK

RUN

SETUP

ETHERNET

(HUB)

RJ-45 Ethernet Port
(connects to hub)

Power supply wiring

The device power supply –Ve terminal is not isolated from earth/
ground.

* Connect the negative

( – ) supply terminal
and the GND screw
(located on the rear of
the module) to earth/
ground as close to the
device as possible.

Do not connect the

positive ( + ) supply
terminal to earth/
ground.

RS-232 Port

RS-232

(DCE)

B A
RS-485 SUPPLY

+-

COM

+-

DIOCOM

RS-485 Resistor
Termination Switch

B A

B A

RS-485 connections

Use shielded twisted pair cable to
interconnect modules to reduce
potential RFI.

Maintain the polarity of the two
RS-485 wires.

B A

RS-485

Terminate each end of the
network with a 120-ohm resistor.
An on-board terminating resistor is
provided in the modem and can be

115S-xx 115S-xx

engaged by setting the DIP switch
on the end plate to ON.

B A B A

+

–

RS-232 connections

RS-232

(DCE)

945U to DTE (Host)

2

RD

3

TD

5

SG

7

RTS

8

CTS

6

DSR

4

DTR

1

DCD

DB-9 MALE

(945U is Female)

DB-9 FEMALE

(DTE is Male)

2

RD

3

TD

5

SG

7

RTS

8

CTS

6

DSR

4

DTR

1

DCD

945U to DCE (Modem)

2

3

5

7

8

6

4

1

2

RD

3

TD

5

SG

7

RTS

8

CTS

6

DSR

4

DTR

1

DCD

DB-9 MALE

(DCE is Female)

RD

TD

SG

RTS

CTS

DSR

DTR

DCD

DB-9 MALE

(945U is Female)

Digital input and output wiring

The digital input/output (DIO) channel can be wired as either input or
output.

COM DIO

Digital InputDigital Output

COM DIO

9-30 Vdc

Supply

CAUTION! Avoid ground loops.

Eaton

1000 Eaton Boulevard
Cleveland, OH 44122
United States
Eaton.com

Eaton’s wireless business

www.eaton.com/wireless

2A Fuse or

Circuit Breaker

Connect to Ground as close
to the module as possible

© 2015 Eaton
All Rights Reserved
Printed in USA
Publication No. IL032045EN
Febuary 2016

Max.

30 Vdc

0.5A

DC Load

(relay)

Voltage-Free Contact
or Transistor Device

Eaton is a registered trademark.

All other trademarks are property
of their respective owners.